import { EventGroup } from '../../Utilities';
/**
 * Helper for subscribing and unsubscribing to
 * drag and drop events on an HTMLElement.
 *
 * {@docCategory IDragDropHelper}
 */
export interface IDragDropHelper {
    /**
     * Subscribe to events on a DOM node with drag and drop configuration.
     */
    subscribe: (root: HTMLElement, events: EventGroup, options: IDragDropOptions) => {
        key: string;
        dispose: () => void;
    };
    /**
     * Unsubscribe to events registered on a DOM node with key.
     */
    unsubscribe: (root: HTMLElement, key: string) => void;
    /**
     * Dispose of listeners bound to instance of helper.
     */
    dispose: () => void;
}
/**
 * Drag & drop event callback interface.
 *
 * {@docCategory IDragDropHelper}
 */
export interface IDragDropEvents {
    /**
     * Whether or not drop action is allowed.
     */
    canDrop?: (dropContext?: IDragDropContext, dragContext?: IDragDropContext) => boolean;
    /**
     * Whether or not drag action is allowed.
     */
    canDrag?: (item?: any) => boolean;
    /**
     * On drag enter region event callback.
     * Returned string is the css classes that will be added to the entering element.
     */
    onDragEnter?: (item?: any, event?: DragEvent) => string;
    /**
     * On drag leave region event callback.
     */
    onDragLeave?: (item?: any, event?: DragEvent) => void;
    /**
     * On drop event callback.
     */
    onDrop?: (item?: any, event?: DragEvent) => void;
    /**
     * On drag start event callback.
     */
    onDragStart?: (item?: any, itemIndex?: number, selectedItems?: any[], event?: MouseEvent) => void;
    /**
     * On drag end event callback.
     */
    onDragEnd?: (item?: any, event?: DragEvent) => void;
    /**
     * On drag over event callback.
     */
    onDragOver?: (item?: any, event?: DragEvent) => void;
    /**
     * Whether the whole group is draggable. This applies after canDrag returns true for the group.
     */
    canDragGroups?: boolean;
}
/**
 * Drag & drop event contextual information.
 *
 * {@docCategory IDragDropHelper}
 */
export interface IDragDropContext {
    /**
     * Data associated with drag & drop action.
     */
    data: any;
    /**
     * Index of drag & drop action.
     */
    index: number;
    /**
     * Whether or not drag & drop region is indivual or group of content.
     */
    isGroup?: boolean;
}
export interface IDragDropTarget {
    root: HTMLElement;
    options: IDragDropOptions;
    key: string;
}
/**
 * The drag and drop event listener configuration.
 *
 * {@docCategory IDragDropHelper}
 */
export interface IDragDropOptions {
    /**
     * Unique key to associate with instance.
     */
    key?: string;
    /**
     * Map of event name to callback function to subscribe to.
     */
    eventMap?: {
        eventName: string;
        callback: (context: IDragDropContext, event?: any) => void;
    }[];
    /**
     * Selection index on drag and drop event.
     */
    selectionIndex: number;
    /**
     * Context associated with drag and drop event.
     */
    context: IDragDropContext;
    /**
     * Callback on drop state update.
     */
    updateDropState: (isDropping: boolean, event: DragEvent) => void;
    /**
     * Whether or not drop action is allowed.
     */
    canDrop?: (dropContext?: IDragDropContext, dragContext?: IDragDropContext) => boolean;
    /**
     * Whether or not drag action is allowed.
     */
    canDrag?: (item?: any) => boolean;
    /**
     * On drag start event callback.
     */
    onDragStart?: (item?: any, itemIndex?: number, selectedItems?: any[], event?: MouseEvent) => void;
    /**
     * On drop event callback.
     */
    onDrop?: (item?: any, event?: DragEvent) => void;
    /**
     * On drag end event callback.
     */
    onDragEnd?: (item?: any, event?: DragEvent) => void;
    /**
     * On drag over element(s) event callback.
     */
    onDragOver?: (item?: any, event?: DragEvent) => void;
}
/**
 * {@docCategory IDragDropHelper}
 */
export interface IDragDropEvent {
    /**
     * Whether or not the drag & drop event was handled.
     */
    isHandled?: boolean;
}